Constructing Dot Diagram
Constructing Dot Diagram
Secondary 2
The table below shows the marks obtained by \(20\) students in a mathematics test.
\(14\) | \(9\) | \(8\) | \(13\) | \(10\) |
|---|---|---|---|---|
\(7\) | \(13\) | \(11\) | \(10\) | \(13\) |
\(8\) | \(12\) | \(9\) | \(9\) | \(15\) |
\(1\) | \(14\) | \(7\) | \(8\) | \(9\) |
- Represent the data on a dot diagram.
- Briefly describe the distribution of the data.
- A student is selected at random. The probability that the student obtains at most \(x\) marks is \(\frac{3}{5}\). Find the values of \(x\).
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Answer:(a) Dot counts: \(1:1,\ 7:2,\ 8:3,\ 9:4,\ 10:2,\ 11:1,\ 12:1,\ 13:3,\ 14:2,\ 15:1\) (b) Range \(1\) to \(15\), cluster from \(7\) to \(15\), outlier \(1\), mode \(9\) (c) \(x=10\) marks
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